build(python): make NOX_SESSION optional (#32)

I added this accidentally in #889. `NOX_SESSION` should be passed down if it is set but not marked required.

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Tue Jan 19 09:38:04 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: ba960d730416fe05c50547e975ce79fcee52c671
Source-Link: googleapis/synthtool@ba960d7

Author: yoshi-automation

packages/google-cloud-recaptcha-enterprise/.trampolinerc

@@ -18,7 +18,6 @@
 required_envvars+=(
     "STAGING_BUCKET"
     "V2_STAGING_BUCKET"
-    "NOX_SESSION"
 )
 
 # Add env vars which are passed down into the container here.

packages/google-cloud-recaptcha-enterprise/synth.metadata

@@ -3,8 +3,8 @@
     {
       "git": {
         "name": ".",
-        "remote": "git@github.com:googleapis/python-recaptcha-enterprise",
-        "sha": "24a724739ccd8d627e44dec23c05f47960bc276f"
+        "remote": "https://github.com/googleapis/python-recaptcha-enterprise.git",
+        "sha": "7f9db7203246c0911ad1760ffc8e56cc61acd224"
       }
     },
     {
@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
+        "sha": "ba960d730416fe05c50547e975ce79fcee52c671"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
+        "sha": "ba960d730416fe05c50547e975ce79fcee52c671"
       }
     }
   ],
@@ -40,5 +40,94 @@
         "generator": "bazel"
       }
     }
+  ],
+  "generatedFiles": [
+    ".coveragerc",
+    ".flake8",
+    ".github/CONTRIBUTING.md",
+    ".github/ISSUE_TEMPLATE/bug_report.md",
+    ".github/ISSUE_TEMPLATE/feature_request.md",
+    ".github/ISSUE_TEMPLATE/support_request.md",
+    ".github/PULL_REQUEST_TEMPLATE.md",
+    ".github/release-please.yml",
+    ".github/snippet-bot.yml",
+    ".gitignore",
+    ".kokoro/build.sh",
+    ".kokoro/continuous/common.cfg",
+    ".kokoro/continuous/continuous.cfg",
+    ".kokoro/docker/docs/Dockerfile",
+    ".kokoro/docker/docs/fetch_gpg_keys.sh",
+    ".kokoro/docs/common.cfg",
+    ".kokoro/docs/docs-presubmit.cfg",
+    ".kokoro/docs/docs.cfg",
+    ".kokoro/populate-secrets.sh",
+    ".kokoro/presubmit/common.cfg",
+    ".kokoro/presubmit/presubmit.cfg",
+    ".kokoro/publish-docs.sh",
+    ".kokoro/release.sh",
+    ".kokoro/release/common.cfg",
+    ".kokoro/release/release.cfg",
+    ".kokoro/samples/lint/common.cfg",
+    ".kokoro/samples/lint/continuous.cfg",
+    ".kokoro/samples/lint/periodic.cfg",
+    ".kokoro/samples/lint/presubmit.cfg",
+    ".kokoro/samples/python3.6/common.cfg",
+    ".kokoro/samples/python3.6/continuous.cfg",
+    ".kokoro/samples/python3.6/periodic.cfg",
+    ".kokoro/samples/python3.6/presubmit.cfg",
+    ".kokoro/samples/python3.7/common.cfg",
+    ".kokoro/samples/python3.7/continuous.cfg",
+    ".kokoro/samples/python3.7/periodic.cfg",
+    ".kokoro/samples/python3.7/presubmit.cfg",
+    ".kokoro/samples/python3.8/common.cfg",
+    ".kokoro/samples/python3.8/continuous.cfg",
+    ".kokoro/samples/python3.8/periodic.cfg",
+    ".kokoro/samples/python3.8/presubmit.cfg",
+    ".kokoro/test-samples.sh",
+    ".kokoro/trampoline.sh",
+    ".kokoro/trampoline_v2.sh",
+    ".pre-commit-config.yaml",
+    ".trampolinerc",
+    "CODE_OF_CONDUCT.md",
+    "CONTRIBUTING.rst",
+    "LICENSE",
+    "MANIFEST.in",
+    "docs/_static/custom.css",
+    "docs/_templates/layout.html",
+    "docs/conf.py",
+    "docs/multiprocessing.rst",
+    "docs/recaptchaenterprise_v1/recaptcha_enterprise_service.rst",
+    "docs/recaptchaenterprise_v1/services.rst",
+    "docs/recaptchaenterprise_v1/types.rst",
+    "google/cloud/recaptchaenterprise/__init__.py",
+    "google/cloud/recaptchaenterprise/py.typed",
+    "google/cloud/recaptchaenterprise_v1/__init__.py",
+    "google/cloud/recaptchaenterprise_v1/py.typed",
+    "google/cloud/recaptchaenterprise_v1/services/__init__.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/__init__.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/async_client.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/client.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/pagers.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/transports/__init__.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/transports/base.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/transports/grpc.py",
+    "google/cloud/recaptchaenterprise_v1/services/recaptcha_enterprise_service/transports/grpc_asyncio.py",
+    "google/cloud/recaptchaenterprise_v1/types/__init__.py",
+    "google/cloud/recaptchaenterprise_v1/types/recaptchaenterprise.py",
+    "mypy.ini",
+    "noxfile.py",
+    "renovate.json",
+    "scripts/decrypt-secrets.sh",
+    "scripts/fixup_recaptchaenterprise_v1_keywords.py",
+    "scripts/readme-gen/readme_gen.py",
+    "scripts/readme-gen/templates/README.tmpl.rst",
+    "scripts/readme-gen/templates/auth.tmpl.rst",
+    "scripts/readme-gen/templates/auth_api_key.tmpl.rst",
+    "scripts/readme-gen/templates/install_deps.tmpl.rst",
+    "scripts/readme-gen/templates/install_portaudio.tmpl.rst",
+    "setup.cfg",
+    "testing/.gitignore",
+    "tests/unit/gapic/recaptchaenterprise_v1/__init__.py",
+    "tests/unit/gapic/recaptchaenterprise_v1/test_recaptcha_enterprise_service.py"
   ]
 }